Which of the following changes is most likely to convert a ligand-gated sodium c

Question

Which of the following changes is most likely to convert a ligand-gated sodium channel into a ligand-gated potassium channel? A change in the primary amino acid sequence so that the protein is more positively charged A mutation in the ligand binding site so that k+ can induce the opening of the channel A mutation that changes the selectivity inter of the channel A mutation that alters the subcellular location of the channel None of the above is likely to change the specificity of the sodium channel Under which of the following conditions do you expect to see treadmilling of the action filament? The critical concentrations of F-actin are: (+)-end: 0.12microM (-)-end: 0.6 microM The cytosolic concentration of G-action-ATP is 0.4 microM, but you have added 0.3 microM of the sequestering protein thymosin to your reaction Thymosin binds to G-actin ATP in a ratio of 1:1 The cytosolic concentration or G-actin-ATP is 0.15 microM and or G-actin ADP is 0.2 micorM. The cytosolic concentration of G-actin-ATP is 0.7 microM, but your reaction also contains profilin, an enzyme that converts G-actin-ADP into G-actin-ATP The cytosolic concentration of G-actin-ATP is 0.4 microM. out you have also added the end capping protein tropomodulin to your reaction The cytosolic concentration of G-actin-ATP is 0.1 microM Which of the following statements best describes a feature of mitochondrial DNA? Mitochondrial DNA is replicated at the same time as nuclear DNA Mitochondrial DNA is associated with the outer micochondrial membrane The genome of mitochondria is the same size in all eukaryotic cells. Mutations in mitochondrial DNA are repaired by an efficient repair machinery Mitochondrial DNA of human cells only encodes tor a small percentage of proteins mat function in mitochondria

Explanation / Answer

1. a change in the primary amino acid sequence so that the protein is more positively charged

2.

3. mutaion in mitochondrial DNA are repaired by an efficient repair machinery

4.

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